Magnets for magnetic filter assemblies and method of producing same



1968 SABURO MIYATA MAGNETS FOR MAGNETIC FILTER ASSEMBLIES AND METHOD OF PRODUCING SAME Filed June 2, 1965 FIG. 6.

IN VENTOR SABURO MIYATA AGENT United States Patent 3,411,120 MAGNETS FOR MAGNETIC FILTER ASSEMBLIES AND METHOD OF PRODUCING SAME Saburo Miyata, 58 Shimo Takanawa, Minato-ku, Yokohama, Japan Filed June 2, 1965, Ser. No. 460,674 7 Claims. (Cl. 335-302) ABSTRACT OF THE DISCLOSURE A filter comprising a chamber having inlet and outlet ports is provided in the chamber with a plurality of spherical magnets to form a porous mass of magnetic material. The spherical magnets are encased in sleeves of nonferrous material to prevent lining up of magnetic poles. A sleeve is formed from a sheet of material rolled about the sphere and having portions thereof deformed inwardly toward the diameter of the sleeve to confine the sphere.

This invention relates to magnets for magnetic filter assemblies and method of producing same, and more particularly for spherical magnets for such assemblies. Spherical magnets when used in assemblies, such as the magnetic filter of US. Patent No. 2,943,739, tend to line up their poles and thus reduce the effective flux available for filtering. A means to prevent such lining up of poles is shown in U.S. Patent No. 3,059,910, wherein the spherical magnets are individually encased in plastic sleeves. Since there are reasons why the plastic sleeves may not always prove satisfactory, the encased magnets of the present invention are deemed superior.

An object of this invention is the provision of means for encasing spherical magnets to prevent lining up of poles when a number of such magnets are assembled in a receptacle.

Another object of this invention is the provision of means for shielding spherical magnets from one another without materially reducing the intensity of the flux.

A further object of this invention is the provision of a magnet assembly for filtering fluids, comprising a plurality of spherical magnets in a receptacle including means preventing lining up of the magnetic poles to reduce effective flux.

A still further object of this invention is the provision of an individual nonferrous metallic sleeve for each spherical magnet and the method of producing same.

These and other objects will become apparent from a consideration of the following specification taken with the accompanying drawings, which together form a complete disclosure of my invention.

In the drawings, wherein like characters of reference indicate like parts throughout the several figures:

FIG. 1 shows the first step in forming a metallic sleeve of this invention;

' FIG. 2 shows the completed sleeve;

FIG. 3 is a longitudinal axial section of the sleeve and a magnet therein;

FIG. 4 is an axial section of a slightly modified form of sleeve;

FIG. 5 is an axial section of a further modified form of the sleeve;

FIG. 6 is a magnetic filter using the sleeved magnets of this invention;

FIG. 7 is a modified form of filter; and

FIG. 8 is a further modified form of filter.

Referring now to FIGS. 1 to 3, a strip 10 of nonferrous metal, preferably copper, slightly wider than the diameter of a spherical magnet, is cut to proper length. At a suitable point in its length the strip 10 is transversely slit part way across from each side at 11, 12, 13 and 14,

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forming respectively the tongues 15 and 16. The strip 10 is then rolled about the spherical magnet 17 to form the sleeve 18, and the tongues 15, 16 are bent inwardly toward and into engagement with the magnet 17 to hold same firmly in place.

In FIG. 4, a slightly modified form of sleeve 118 is shown wherein a sheet is rolled about a magnet 117 and two V-grooves 120, and 121 are formed at points slightly inwardly from the ends of the sleeve firmly holding the magnet 117 in place.

In the modification of FIG. 5, a strip 210 is rolled about the magnet 217 to form the sleeve 218. The ends of the sleeve 218 are swaged inwardly, as at 225 and 226, about the magnet 217 so as to hold the magnet firmly in place.

In FIG. 6, I show a magnetic filter 50 for filtering fluids and having a tube 51 of nonferrous metal, identical end bells 52, 53 connected thereto respectively by threads 54 and 55. The end bell 52 has a threaded fluid inlet 56, and the end bell 55 has a threaded fluid outlet 57. In the end bell 52 there is an annular flange 58 on which is placed a screen or other mechanical filter 59. The end of the tube 51 rests against the screen 59, holding it in place. Suitable gaskets may be provided at either side of screen 59 if desired or necessary.

In the end bell 53, there is an annular flange 60. A screen or other mechanical filter 61 is placed between the tube 51 and the flange 60. Identical end plugs 62 which may be plastic or metal are placed in the end bells 52 and 53 respectively to provide access for cleaning the filters 59 and 60.

Within the tube 51, between the filters 59 and 60 there is a plurality of sleeves 18 with the magnets 17. It is to be noted that the sleeves 18 are variously and heterogeneously oriented so that the total available flux for filtering purposes is not materially reduced by lining up of magnetic poles.

In FIG. 7, I show a filter having a casing 151 and an inlet 156. The casing 151 may taper as at 151 toward the outlet 157. Within the casing 151, between the screens 159 and 161 I provide a magnetic filter comprising a plurality of sleeves 18 with the spherical magnets 17.

In FIG. 8 there is a further modification of the magnetic filter 250 having a casing 251 having an inlet 256 and an outlet 257. Within the casing 251 there is a funnelshaped housing 251 the smaller end of which terminates at the outlet 257. At the ends of the housing 251 there are screens 259 and 260. Between the screens 259 and 260 there is a plurality of sleeves 18 with the magnets 17.

Inside the casing 251, and outside the housing 251 there is a filter 265 attached to the casing at 266 adjacent the outlet 257 and having an impervious end 267. The filter 265 may be a conventional folded paper filter.

The sleeved magnets as shown in FIGS. 3, 4 and 5 perform a novel function, not before known. The space in the interior of the sleeve between the end thereof and the magnets 17, 117 or 217 constitutes a recess 70, and 270 for the collection of ferromagnetic particles. If such particles were accumulated on the exteriors of spherical magnets arranged in the path of a flowing fluid, the current of fluid will dislodge some of them. In the case of these sleeved magnets, particles collect in the recesses 70, 170 and 270 and fluids flowing past them will not dislodge such particles.

In operation, the fluids must first pass through a mechanical filter such as 59, 159 and both 259 and 265 after which they pass over and about the various sleeved magnets in progressing toward the outlets and the screens or mechanical filters 61, 161 and 261. The mechanical filters remove particles down to the limit of their filtering capacity. Fine ferromagnetic particles passing through the 3 mechanical filters 59, 159, 265 and 259 will be trapped by the magnets 17 in the casings 51, 151 and 151 The filters described herein are particularly useful in filtering the oil used in internal combustion motors, and also with grinding machines for filtering the coolant when grinding ferrous metals. These filters are also particularly useful in any system where ferrous material such as a piston or cylinder working against a fluid can cause metallic particles to be entrained in the fluid. Other examples are fluid brake systems, hydraulic systems and refrigeration systems. In such instances wear cause ferromagnetic particles to be taken up by the fiuid, and the particles cause more wear. Removing such particles by means of the filters of this invention increases the life of the machines involved.

Having described my invention in several of its aspects, I desire it to be understood that various other modifications may be made within the skill of the art and the scope of the appended claims.

I claim:

1. In a method of forming a sleeve about a spherical magnet, the steps of:

(a) forming a sheet of nonferrous metal of a width slightly greater than the diameter of the spherical magnet, and of a length equal to a diametrical periphery of the spherical magnet,

(b) rolling the sheet about the spherical magnet to form an integral cylindrical sleeve with its ends projecting beyond the surface of the sphere, and

(c) deforming the rolled sleeve adjacent its ends inwardly toward the sphere by moving portions of the sleeve to a point within the diameter of the sleeve.

2. The method according to claim 1 wherein the deforming comprises rolling a V-groove adjacent either end of the sleeve.

3. The method according to claim 1 wherein the deforming comprises swaging the ends of the sleeve inwardly toward the sphere.

4. In a magnet for use in magnetic filters, a spherical magnet, a cylindrical sleeve of nonferrous metal formed about said spherical magnet and tangential thereto, said sleeve having portions deformed inwardly toward the sphere, said portions constituting annular V-grooves at either side of the point of tangency.

5. A magnet for use in magnetic filters comprising a spherical magnet, an integral cylindrical sleeve of nonferrous metal formed over and tangent to said spherical magnet having an inner diameter equal to the diameter of the spherical magnet and having portions of the circumference thereof formed inwardly toward said spherical magnet at either side of the point of tangency to a point Within the diameter of the cylinder.

6. The structure as defined in claim 5 wherein the formed portions comprise tongues formed from the metal of said sleeve and pressed inwardly toward the spherical magnet.

7. The structure as defined in claim 5 wherein the formed portions comprise inwardly swaged end portions of the sleeve.

References Cited UNITED STATES PATENTS 2,436,740 2/1948 Brooks 210--222 3,059,910 10/1962 Moriya.

FOREIGN PATENTS 664,599 1/1952 Great Britain.

SAMIH N. ZAHARNA, Primary Examiner. 

